Hello all, Our organization is blocking all DAT files from entering our organization due to Virus' exploiting this file type. The problem is that our co-workers in Europe are triggering the filter (the only ones reporting this issue, for both internal and external e-mail users). When I have them send to an external e-mail address so that I can see what may be triggering the filter, I find no .DAT files. The filter is configured to block only .DAT attachments and not 'DAT' in the body text. I can find no .DAT files, or any text with the letters 'dat' that may be causing the filter to block their e-mail. What should I look for since there are no attachments? Could a signature in exchange, or some other setting be placing a .DAT file in their e-mails? Any assistance would be much appreciated. Thanks, Chris Wall Microsoft Exchange Admin / Sr. Technical Analyst 9000 Regency Parkway 4th floor Cary, NC 27511 Tel. +1 919.460.3236 Fax +1 919.468.4889 Global Knowledge Experts Teaching Experts http://www.globalknowledge.com <http://www.globalknowledge.com>